The Celtics have been a mess all season. They entered Sunday with a 20-23 record, eighth in the Eastern Conference. Head coach Doc Rivers has threatened to make changes if things don't get better, but now he will be forced to adjust on the fly without his star point guard.

To illustrate the loss that the Celtics are feeling on the floor right now, Twitter has provided insight as only it can.

The people over at NOT SportsCenter provided an update on the Celtics' already-slim postseason hopes in light of this announcement.

BREAKING: With Rajon Rondo officially having a torn ACL, the #Celtics have been officially eliminated from playoff contention through 2018

Here are two tidbits of information from ESPN Stats & Info, with one illustrating how special Rondo has been this season and another trying to provide hope to upset fans. First, here is how impressive Rondo's stats this season (13.7 points, 11.1 assists and 5.6 rebounds per game) are.

Times were already tough in Boston. The franchise needed to find a way to build around its star point guard. Now, general manager Danny Ainge could change his plans about standing pat at the trade deadline.